Last ethnic map before the breakup of Yugoslavia in 1991. Serbs were the largest ethnic group of the country followed by Croats and Bosniaks.
The number and distribution of the Albanians is only estimated because almost all of them boycotted the census following a call by Ibrahim Rugova (politican) to boycott Serbian institutions.
The demography of the former Yugoslav Republics changed significantly in consequence of the Yugoslav Wars.
Yugoslav Republics by population (as of 1991)
Serbia (proper): 5,824,126
Croatia: 4,760,344
Bosnia and Herzegovina: 4,364,574
Macedonia: 2,033,964
Vojvodina: 2,012,605
Kosovo: 1,954,744
Slovenia: 1,962,606
Montenegro: 615,276
Sources: